:root{--ink:#1f2328;--ink2:#57606a;--bg:#fff;--card:#f6f8fa;--accent:#d97706;--line:#e5e7eb}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.7}
main{max-width:760px;margin:0 auto;padding:32px 20px 60px}
h1{font-size:1.7rem;margin:.2em 0}h2{font-size:1.15rem;margin:1.8em 0 .6em;border-left:4px solid var(--accent);padding-left:.6em}
.lang-zh,.lang-en{margin-bottom:2.5rem}.lang-en{color:#333}
.lang-tag{display:inline-block;background:var(--card);border:1px solid var(--line);border-radius:6px;padding:2px 10px;font-size:.8rem;color:var(--ink2);margin-bottom:.8em}
p,li{font-size:.95rem}ul{padding-left:1.3em}li{margin:.3em 0}
.card{background:var(--card);border-radius:10px;padding:14px 18px;margin:1em 0}
a{color:var(--accent)}.muted{color:var(--ink2);font-size:.85rem}
nav{display:flex;gap:14px;flex-wrap:wrap;padding:14px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(6px)}
nav a{text-decoration:none;font-size:.9rem;font-weight:600}
@media(max-width:480px){main{padding:20px 16px 48px}h1{font-size:1.45rem}}